Mitsubishi Lancer Evolution X. Manual - part 318

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-337

STEP 18. Check for open circuit and short circuit to
ground and harness damage between No. 4 cylinder
injector connector B-104 (terminal No. 2) and ECM
connector B-09 (terminal No. 19).
Q: Is the harness wire in good condition?

YES : Go to Step 19.
NO : Repair it. Then go to Step 20.

STEP 19. Using the oscilloscope, check the No. 4 cylinder
injector.
(1) Disconnect the No. 4 cylinder injector connector B-104 and

connect the test harness special tool MB991658 between
the separated connectors. (All terminals should be
connected.)

(2) Connect the oscilloscope probe to the injector side

connector terminal No. 2.
NOTE: When measuring with the ECM side connector, dis-
connect all ECM connectors. Connect the check harness
special tool (MB992110) between the separated connec-
tors. Then connect the oscilloscope probe to the check har-
ness connector terminal No. 19.

(3) Start the engine and run at idle.

(4) Measure the waveform.

• The waveform should show a normal pattern similar to

the illustration.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How to

Cope with Intermittent Malfunctions

P.00-15

NO : Replace the ECM. When the ECM is replaced,

P.42B-11

or GROUP 42C, ID Codes

Registration Judgment Table <Vehicles with WCM>

P.42C-9

. Then go to Step 20.

STEP 20. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function − OBD-II Drive Cycle − Pattern 23

P.13A-9

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0204 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AK604471

1 2

Injector
connector

MB991658

Oscilloscope

AK604546 AB

Normal waveform

A:Injector drivetime

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DTC P0219: Engine Over Speed Condition

TECHNICAL DESCRIPTION

• The ECM monitors the engine rotational speed.

When the engine rotation increases to the speed
which has possibility of failure, the ECM stores
the diagnostic trouble code.

Check Condition

• Ignition switch is "ON" position.

Judgment Criterion

• The maximum engine rotational speed stored in

the past was more than 8,043 r/min.

FAIL-SAFE AND BACKUP FUNCTION

• None

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)

• The failure is supposed to be attributed to the

excessive engine rotational speed.

DIAGNOSIS

1. When this diagnostic trouble code is output, check whether

the engine malfunctions or not.
NOTE: Except for an engine malfunction, there are possible
causes attributed to the excessive engine rotational speed.
Check whether there is another malfunction except the
engine failure.

2. If there is a malfunction, check and repair it.
3. After the repair, initialize the learning value. (Refer to

GROUP 00, Precautions Before Service − Initialization Pro-

cedure For Learning Value In MFI Engine

P.00-35

.) Delete

the diagnostic trouble codes.
NOTE: If there is neither malfunction nor repair, it is not
necessary to initialize the learning value or delete the diag-
nostic trouble code.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DTC P0222: Throttle Position Sensor (sub) Circuit Low Input

CIRCUIT OPERATION

• A 5-volt power supply is applied on the throttle

position sensor (sub) power terminal (terminal
No. 5) from the ECM (terminal No. 12).

• A voltage that is according to the throttle opening

angle is sent to the ECM (terminal No. 11) from
the throttle position sensor (sub) output terminal
(terminal No. 6).

AK604243

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

1 2 3 4 5

5 V

THROTTLE POSITION SENSOR (SUB) CIRCUIT

THROTTLE POSITION
SENSOR (SUB)

B-09

HALL IC

B-11

(MU805200)

ENGINE
CONTROL
MODULE

YELLO

-RED

YELLO

-PINK

YELLO

-GRA

AK704227

Connector: B-09

ECM

B-09 (GR)

AK704247AB

Connector: B-11

B-11 (B)

Radiator cap

Throttle body assembly
(incorporating throttle
position sensor)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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• The ground terminal (terminal No. 3) is grounded

with ECM (terminal No. 13).

TECHNICAL DESCRIPTION

• The throttle position sensor (sub) outputs voltage

which corresponds to the throttle valve opening
angle.

• The ECM checks whether the voltage is within a

specified range.

DESCRIPTIONS OF MONITOR METHODS

Throttle position sensor (sub) output voltage is out of

specified range.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Malfunction

End

Good

Output voltage <= 0.2V

Output voltage >= 4.8V

AK604318

Start

Yes

Continuous

failure for 0.3sec

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